#!/bin/bash
export LC_ALL=POSIX
WORK_DIR=$HOME"/.gitAutoPull"

work_array="."

if [ $# -gt 0 ]; then
	work_array=$@
fi

for GIT_REPO in $work_array ; do

	GIT_REPO_NAME="$(echo '$GIT_REPO' | tr '/' '_' | tr -d '~')"
	CHECK_TIMER_FILE=$WORK_DIR/localCommitsCheck"$GIT_REPO_NAME"
	
	cd $GIT_REPO > /dev/null
	
	if [ $? -ne 0 ]; then
		echo $GIT_REPO" Does not exist or is not a directory"
		exit -2
	fi
	
	if [ -z "$(git rev-parse --git-dir 2>/dev/null)" ]; then
		echo $GIT_REPO" is not a git repository"
		exit -2
	fi
	
	if [ ! -d $WORK_DIR ]; then
		mkdir $WORK_DIR > /dev/null
	fi
	
	if [ ! -d $WORK_DIR ]; then
		echo "Could not create work directory, aborting"
		exit -4
	fi
	
	if [ -e $CHECK_TIMER_FILE ]; then
		read count < $CHECK_TIMER_FILE
		if [ $cout -ne 0 ]; then
			echo $(( $count - 1 )) > $CHECK_TIMER_FILE
			exit -1
		else
			rm -f $CHECK_TIMER_FILE
		fi
	fi
	
	remoteStatus="$(git fetch --dry-run 2>&1 | tail -n 1 | grep -v -e'+')"		# Empty if there are no commits to fetch

	refChanges=$(git push -n --porcelain | grep -e'refs')
	nbRefs=$(echo "$refChanges" | wc -l)
	nbNonPushRefs=$(echo $(echo "$refChanges" | cut -f1) | wc -w)


	localStatus="Nothing to do"													# Empty if there are commits to push

	if [ ! -z $(echo $refChanges | grep -e"*") ]; then
		localStatus=""
	fi

	if [ ! $nbRefs -eq $nbNonPushRefs ]; then
		localStatus=""
	fi

	output=$(
	if [ -z "$remoteStatus" ]; then
		if [ -z "$localStatus" ]; then
			echo "Pushing "$GIT_REPO" updates to origin"
			git push 2>&1
			exit 1
		fi
	else
		if [ -z "localStatus" ]; then
			echo "Local and remote diverged, stopping auto-update for 30 iterations..."
			echo 30 > $WORK_DIR/localCommitsCheck"$GIT_REPO_NAME"
		else
			echo "Updating "$GIT_REPO" with remote commits"
			git fetch --all 2>&1
			git remote update 2>&1
			exit 1
		fi
	fi )

	if [ ! -z "$output" ]; then
		echo "$output" | wall
	fi
	
done

exit 0